ORLANDO, Fla. — Casey Anthony, the young mother whose seeming heartlessness at the disappearance of her daughter transfixed America for three years, was found not guilty on Tuesday of killing the girl, Caylee Marie.

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After nearly six weeks of testimony, a panel of seven women and five men decided that Ms. Anthony did not murder Caylee by dosing her with chloroform, suffocating her with duct tape and dumping her in a wooded area, as prosecutors claimed. They also did, however, find her guilty of lesser charges, of providing false information to law enforcement officers. The jury did not ask to review any evidence.